The effect of serotonin on the rabbit isolated iris sphincter muscle
作者:
BarnettNigel L.,
OsborneNeville N.,
期刊:
Current Eye Research
(Taylor Available online 1993)
卷期:
Volume 12,
issue 7
页码: 665-673
ISSN:0271-3683
年代: 1993
DOI:10.3109/02713689309001846
出版商: Taylor&Francis
数据来源: Taylor
摘要:
The rabbit isolated iris sphincter muscle maintained in an isotonic state is unaffected by applied serotonin (5-hydroxytryptamine or 5-HT) whereas carbachol causes the muscle to contract. Serotonin does, however, produce a relaxation of the contracted muscle in a dose-dependent manner. This effect is also induced by the 5-HT receptor agonists 8-OH-DPAT (8-hydroxy-2-[di-n-propyl-amino] tetralin, RU 24969 (5-methoxy-3-[l, 2, 3, 6, tetrahydro-4-pyridinyl]-1-indole) and ipsapirone, suggesting the involvement of 5-HT1Areceptors. This view is supported by the finding that metergoline, methysergide and propranolol all counteracted the effect produced by serotonin. While 5-HT3receptors are not involved in the described process, a minor involvement of 5-HT2receptors cannot be excluded as methysergide partially counteracted the serotonin response. These data provide evidence that serotonin receptors, in particular the 5-HT1Asubtype, may be associated with the iris sphincter muscle and suggest their involvement in the regulation of pupil size.
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